For cube test two types of specimens either cubes of 150mm X 150mm X 150mm or 100mm X 100mm x 100mm depending upon the size of aggregate are used. For most of the works cubical moulds of size 150mm x 150mm x 150mm are commonly used.

This concrete is poured in the mould and tempered properly so as not to have any voids. After 24 hours these moulds are removed and test specimens are put in water for curing. The top surface of these specimen should be made even and smooth. This is done by putting cement paste and spreading smoothly on whole area of specimen.

These specimens are tested by compression testing machine after 7 days curing or 28 days curing. Load should be applied gradually at the rate of 140 kg/cm2 per minute till the Specimens fails. Load at the failure divided by area of specimen gives the compressive strength of concrete.


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